CN114390869B

CN114390869B - Unidirectional heat transfer pipe with Y-shaped diversion table liquid suction core and processing method thereof

Info

Publication number: CN114390869B
Application number: CN202210048414.6A
Authority: CN
Inventors: 向建化; 魏鑫; 周伟; 黄家乐; 李萍; 杨文强; 顾书
Original assignee: Guangzhou University
Current assignee: Guangzhou University
Priority date: 2022-01-17
Filing date: 2022-01-17
Publication date: 2023-09-08
Anticipated expiration: 2042-01-17
Also published as: CN114390869A

Abstract

The invention provides a unidirectional heat transfer heat pipe with a Y-shaped flow guide table liquid suction core and a processing method thereof, which relate to the technical field of heat dissipation elements and comprise a first heat transfer component and a second heat transfer component, wherein the first heat transfer component and/or the second heat transfer component are/is provided with flow guide grooves, one sides of the first heat transfer component and the second heat transfer component, which are provided with the flow guide grooves, are mutually connected to form a closed flow guide cavity, the bottom surface and the top surface of the flow guide cavity are respectively and uniformly provided with Y-shaped flow guide tables with consistent directions, and the flow guide cavity is filled with working media; according to the invention, the Y-shaped flow guiding table is used for guiding the working medium in the flow guiding cavity in one direction, so that the one-way heat transfer of the first heat transfer component and the second heat transfer component is realized, and the electronic element is effectively protected from being damaged by high temperature; in addition, because of the combined flow guiding structure of the Y-shaped flow guiding table on the surface, the processing technology is simple, and compared with the existing laser engraving processing technology, the cost is lower, the technical limit is small, and the processing technology has universality.

Description

Unidirectional heat transfer pipe with Y-shaped diversion table liquid suction core and processing method thereof

Technical Field

The invention relates to the technical field of heat dissipation elements, in particular to a unidirectional heat transfer heat pipe with a Y-shaped flow guide table liquid suction core and a processing method thereof.

Background

With the advent of various high-power electronic products, how to better dissipate heat has become an associated problem. The heat pipe is used as a high-efficiency heat transfer element and is widely used for radiating the electronic device; the traditional heat pipe has bidirectional property, namely, heat transfer in two directions can be realized, and the heat transfer direction is determined by the high temperature at two ends, namely, the heat is transferred from a high temperature section to a low temperature section.

Under normal working conditions, the heating element (such as a chip) and the like are in a high-temperature section, the heat radiating element is in a low-temperature section, and the heat pipe transmits the temperature of the heating element to the heat radiating section and releases heat. However, in the case of a failure of the electronic device, the temperature of the heat dissipation element is higher than that of the heat generation element, so that the external temperature is transmitted to the heat generation element, and the heat generation element (such as a chip) is damaged, resulting in a huge loss.

The existing heat pipe mainly uses a laser engraving technology to process micro grooves on a metal sheet as a liquid suction core, so that the heat pipe conveys liquid through a microstructure below the surface, and the processing technology is complex and high in cost.

Disclosure of Invention

The invention aims to provide a unidirectional heat transfer heat pipe with a Y-shaped flow guide table liquid suction core and a processing method thereof, which can protect electronic elements through a unidirectional heat transfer structure, and meanwhile, the unidirectional heat transfer structure is positioned on a surface, so that the processing is simpler, and the processing cost can be effectively reduced;

the invention provides a unidirectional heat transfer heat pipe with a Y-shaped flow guide table liquid suction core, which comprises a first heat transfer component and a second heat transfer component, wherein the first heat transfer component and/or the second heat transfer component are/is provided with flow guide grooves, one sides of the first heat transfer component and the second heat transfer component, which are provided with the flow guide grooves, are mutually connected to form a closed flow guide cavity, the bottom surface and the top surface of the flow guide cavity are respectively and uniformly provided with Y-shaped flow guide tables with consistent directions, and the flow guide cavity is filled with working media.

Further, the plurality of Y-shaped diversion tables are uniformly arranged along the length direction and staggered along the width direction, and the bifurcation part of the Y-shaped diversion tables at the non-edge position is positioned between the straight line parts of two adjacent Y-shaped diversion tables.

Further, a gap is formed between the Y-shaped flow guiding tables on the bottom surface and the top surface of the flow guiding cavity, and the Y-shaped flow guiding tables have hydrophilicity.

Further, the Y-shaped flow guiding tables are distributed in the middle of the flow guiding cavity along the width direction to form a liquid channel, and gas channels are formed in the two sides of the flow guiding cavity along the width direction.

Further, a liquid injection hole is formed in the side wall of the diversion cavity in a penetrating mode.

Further, the first heat transfer component is provided with a protruding portion, the liquid injection hole penetrates through the protruding portion, the protruding portion is provided with a mounting hole coaxial with the liquid injection hole, and a liquid filling pipe is inserted into the mounting hole.

Further, the flow guiding cavity is in a negative pressure or vacuum state.

Further, the first heat transfer component is a heat transfer box, the second heat transfer component is a heat transfer cover, and the Y-shaped flow guide table is respectively positioned on the bottom of the inner wall of the heat transfer box and the bottom wall of the heat transfer cover.

Further, the heat transfer cover is made of transparent material.

The invention also provides a processing method of the unidirectional heat transfer heat pipe with the Y-shaped diversion table liquid suction core, which comprises the following steps:

s1, processing a first heat transfer component and a second heat transfer component, and processing a plurality of Y-shaped diversion tables which are uniformly arrayed and have the same direction on the side surfaces of a diversion cavity formed by the first heat transfer component and the second heat transfer component;

s2, processing a liquid injection hole and a mounting hole on the outer side surface of the first heat transfer component;

s3, performing hydrophilic treatment on the Y-shaped diversion table;

s4, connecting the first heat transfer component and the second heat transfer component to form a diversion cavity, wherein the Y-shaped diversion tables on the inner bottom surface of the diversion cavity are aligned with the Y-shaped diversion tables on the top surface of the diversion cavity one by one;

s5, sealing the joint of the first heat transfer component and the second heat transfer component through high-temperature resistant glue, and inserting a liquid filling pipe into the mounting hole;

s6, injecting working liquid through a liquid filling pipe, and vacuumizing the inside of the diversion cavity through the liquid filling pipe;

s7, stamping the liquid filling pipe to deform, and then welding and sealing the pipe orifice of the liquid filling pipe to form a sealing port.

According to the technical scheme, the Y-shaped flow guide tables with the same directions are arrayed in the flow guide cavity, so that working media in the flow guide cavity are subjected to unidirectional flow guide, and the working media can only flow from the contact ends of heating elements to the contact ends of radiating elements of the two heat transfer assemblies in a liquid state, so that unidirectional heat transfer of the first heat transfer assembly and the second heat transfer assembly is realized through unidirectional flow of the liquid working media, and electronic elements are effectively protected from being damaged by high temperature; in addition, the invention has simple processing technique due to the combined flow guiding structure of the Y-shaped flow guiding table on the surface, and has lower cost and less technical limit and universality compared with the existing laser engraving processing technology.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is an exploded view of the present invention;

FIG. 3 is an interior view of a first heat transfer assembly of the present invention;

FIG. 4 is an interior view of a second heat transfer assembly of the present invention;

FIG. 5 is a front view and A-A cross-sectional view of the present invention;

FIG. 6 is a top view of the present invention;

FIG. 7 is a cross-sectional view B-B of FIG. 6 in accordance with the present invention;

FIG. 8 is a cross-sectional view of the C-C of FIG. 6 in accordance with the present invention;

reference numerals illustrate:

the device comprises a 1-first heat transfer component, a 2-second heat transfer component, a 3-diversion trench, a 4-diversion cavity, a 5-Y-shaped diversion table, a 6-gap, a 7-liquid channel, an 8-gas channel, a 9-liquid injection hole, a 10-protruding part, a 11-mounting hole, a 12-liquid filling pipe, a 13-hot end and a 14-cold end;

Detailed Description

The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. Furthermore, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Example 1

As shown in fig. 1-4, the invention provides a unidirectional heat transfer heat pipe with a Y-shaped diversion bench liquid suction core, which comprises a first heat transfer component 1 and a second heat transfer component 2, wherein diversion trenches 3 are formed in the first heat transfer component 1 and/or the second heat transfer component 2, one sides of the first heat transfer component 1 and the second heat transfer component 2 with the diversion trenches 3 are mutually connected to form a sealed diversion cavity 4, Y-shaped diversion benches 5 with a plurality of consistent directions are uniformly arranged on the bottom surface and the top surface of the diversion cavity 4 respectively, and working media are contained in the diversion cavity 4.

Specifically, the first heat transfer component 1 and the second heat transfer component 2 are parts with certain length made of heat conductive materials (such as metals), when in use, one end of the first heat transfer component 1 and one end of the second heat transfer component 2 in a combined state are a hot end 13 and are contacted with a heating element (such as a chip), and the other end is a cold end 14 and is contacted with a heat dissipation element (such as a radiator);

the working medium absorbs heat and releases heat through two forms of liquid and gas to transfer heat energy, the liquid working medium flows unidirectionally from the cold end 14 to the hot end 13 in the diversion cavity 4, when flowing to the hot end 13, the high temperature of the heating element is absorbed to evaporate the working medium into gas, and the gaseous working medium at the cold end 14 of the diversion cavity 4 is cooled and condensed into the liquid working medium by the heat dissipation element and flows unidirectionally to the hot end 13; the gaseous working medium of the cold end 14 is continuously liquefied, so that the gasified working medium of the hot end 13 flows unidirectionally to the cold end 14, and the heat transfer is realized through the liquid-gas circulation, when the temperature of the cold end 14 is higher than the temperature of a hot section due to the fault condition, the working medium cannot form reverse circulation due to the unidirectionally flowing characteristic of the Y-shaped flow guiding table 5, and only can carry out unidirectionally heat transfer, thereby playing a role in protecting electronic elements;

one of the first heat transfer component 1 or the second heat transfer component 2 can be provided with a diversion trench 3, the diversion trench 3 is a diversion cavity 4 after connection, or both the two heat transfer components are provided with diversion trenches 3, and the combination of the two diversion trenches 3 is the diversion cavity 4 after connection;

the height of the Y-shaped diversion bench 5 is 0.5mm, liquid mainly flows along the bench side, and the surface tension of the liquid at the bifurcation part is larger than that of the straight line part because the curvature of the bifurcation part of the single Y-shaped diversion bench 5 is larger than that of the straight line part, so that the liquid flows from the bifurcation part to the straight line part on the single Y-shaped diversion bench 5; the Y-shaped baffle 5 is directional, and can cause liquid to adhere to the side surface and flow unidirectionally, and the liquid has a large flow resistance or cannot flow in the opposite direction, and the function corresponds to a wick.

As shown in fig. 2-4, the plurality of Y-shaped diversion tables 5 are uniformly arranged along the length direction and staggered along the width direction, and the bifurcation part of the Y-shaped diversion table 5 at the non-edge position is positioned between the straight line parts of two adjacent Y-shaped diversion tables 5. Specifically, when the liquid flows to the end of the straight line portion, since the branched portions of the Y-shaped deflector bases 5 on the adjacent sides in the width direction are close to the straight line portion, the liquid is sucked to the branched portions of the Y-shaped deflector bases 5 on the adjacent sides, thereby realizing transition to continue the flow.

As shown in fig. 6-8, a gap 6 is formed between the Y-shaped diversion bench 5 on the bottom surface and the top surface of the diversion cavity 4, and the Y-shaped diversion bench 5 has hydrophilicity. Specifically, the Y-shaped diversion tables 5 distributed up and down can absorb liquid working media at the positions of the unprocessed Y-shaped diversion tables 5 on two sides into the side surfaces and the gaps 6 of the Y-shaped diversion tables 5 in the middle; the height of the gap 6 can reach 0.5mm, and the smaller the distance of the gap 6 is, the stronger the adsorptivity is, and the better the unidirectional flowing effect of the liquid is; hydrophilicity can be achieved by hydrophilic solvents, which are selected variously in the market, such as tetrafluoroboric acid and the like, and will not be described again.

As shown in fig. 6-8, a plurality of Y-shaped diversion tables 5 are distributed in the middle of the diversion cavity 4 along the width direction to form a liquid channel 7, and gas channels 8 are arranged on two sides of the diversion cavity 4 along the width direction; specifically, the flow guiding cavity 4 is a cuboid cavity, the flow guiding cavity 4 is divided into a middle area and two side areas in the width direction of the flow guiding cavity 4, the Y-shaped flow guiding tables 5 are distributed in the middle area, and then the liquid working medium flows unidirectionally from the cold end 14 to the hot end 13 in the middle area; the gaseous working medium evaporated at the hot end 13 flows unidirectionally from the hot end 13 to the cold end 14 at the two side areas; because the two sides of the inside of the diversion cavity 4 are both the gas channels 8, namely, the diversion cavity is provided with two channels, the width of a single gas channel 8 is smaller, and the flow rate of gaseous working media is improved, so that the heat transfer efficiency is improved.

As shown in fig. 5, the side wall of the diversion cavity 4 is provided with a liquid injection hole 9. Specifically, the liquid injection hole 9 is positioned on the side wall of the connection position of the first heat transfer component 1 and the second heat transfer component 2 and is communicated with the inside of the diversion cavity 4, and the working medium is injected into the inside of the diversion cavity 4 through the liquid injection hole 9.

As shown in fig. 1 and 5, the first heat transfer assembly 1 is provided with a protruding portion 10, the liquid injection hole 9 penetrates through the protruding portion 10, the protruding portion 10 is provided with a mounting hole 11 coaxial with the liquid injection hole 9, and a liquid filling pipe 12 is inserted into the mounting hole 11. Specifically, the wall thickness of the position can be increased by the protruding portion 10, the liquid injection hole 9 and the mounting hole 11 are convenient to process, the liquid filling pipe 12 is a copper pipe, working medium can be injected into the diversion cavity 4 through the liquid filling pipe 12, the vacuumizing device can vacuumize the diversion cavity 4 through clamping the liquid filling pipe 12, and after the vacuumizing treatment is completed, the liquid filling pipe 12 can be deformed through stamping, so that a sealing port is formed, and a sealing effect is achieved.

The flow guiding cavity 4 is in a negative pressure or vacuum state. Specifically, the boiling point of the liquid working medium is related to the pressure, when the negative pressure or the vacuum is generated in the diversion cavity 4, the boiling point of the working medium is reduced, if the boiling point of the working medium is lower than the temperature of the heating element by adjusting the pressure in the diversion cavity 4, when the hot end 13 of the first heat transfer component 1 or the second heat transfer component 2 contacts the heating element, the working medium absorbs heat and evaporates into a gaseous state, so that the temperature of the heating element is reduced.

As shown in fig. 1-8, the first heat transfer component 1 is a heat transfer box, the second heat transfer component 2 is a heat transfer cover, and the Y-shaped flow guiding table 5 is respectively positioned on the bottom of the inner wall of the heat transfer box and the bottom wall of the heat transfer cover. Specifically, the heat transfer box and the heat transfer cover can be made of metal sheets (such as copper, aluminum or iron, etc.), the heat transfer box has good heat conduction performance, the heat transfer box is a box-shaped piece, the inside of the box is a heat conduction groove, the Y-shaped flow guide table 5 is positioned at the bottom of the groove, the heat transfer cover is positioned at the cover-shaped piece matched with the box opening of the heat transfer box, the Y-shaped flow guide table 5 is positioned at the cover bottom, and the heat transfer box is embedded and positioned with the heat transfer cover.

The heat transfer box is made of metal heat transfer material, and the heat transfer cover is made of transparent heat transfer material. Specifically, the heat transfer box is made of a metal material with good heat conduction performance, the heat transfer cover is made of a transparent material, such as transparent glass or an acrylic plate, and the like, so that a visual effect is achieved, the internal condition of the diversion cavity 4 is observed in the working process, the technology aesthetic feeling is strong, and the observation and the research are facilitated.

Example 2

The invention also provides a processing method of the unidirectional heat transfer device of the liquid suction core of the Y-shaped flow guide table 5, which comprises the following steps:

s1, processing a first heat transfer component 1 and a second heat transfer component 2, and processing a plurality of Y-shaped diversion tables 5 which are uniformly arrayed and have the same direction on the side surfaces of a diversion cavity 4 formed by the first heat transfer component 1 and the second heat transfer component 2; s2, processing a liquid injection hole 9 and a mounting hole 11 on the outer side surface of the first heat transfer component 1; s3, performing hydrophilic treatment on the Y-shaped diversion table 5; s4, connecting the first heat transfer component 1 and the second heat transfer component 2 to form a diversion cavity 4, and aligning Y-shaped diversion tables 5 on the inner bottom surface of the diversion cavity 4 with Y-shaped diversion tables 5 on the top surface one by one; s5, sealing the joint of the first heat transfer component 1 and the second heat transfer component 2 through high-temperature resistant glue, and inserting a liquid filling pipe 12 into the mounting hole 11; s6, injecting working liquid through the liquid filling pipe 12, and vacuumizing the inside of the diversion cavity 4 through the liquid filling pipe 12; s7, stamping the liquid filling pipe 12 to deform, and then welding and sealing the pipe orifice of the liquid filling pipe 12 to form a sealing port.

Specifically, the processing method can be completed through a numerical control milling machine, for example, in S1, the shapes of the heat transfer box and the heat transfer cover are primarily cut, and the Y-shaped boss is processed at the middle position of the opposite inner side surfaces of the heat transfer box and the heat transfer cover through a numerical control machine tool, so that compared with the existing laser engraving processing technology, the processing method is lower in cost, small in technical limit and more universal.

The working principle of the invention is as follows:

forward heat transfer: one end carved with the cold is a cold end 14, and in practical application, the cold end 14 is in contact with a heat dissipation element, such as a heat dissipation fan of a computer; the middle section is an adiabatic section, and has no temperature change. One end carved with the hot word is a hot end 13, which is contacted with a heating element in practical application, such as a computer CPU; in the invention, the middle of the diversion cavity 4 is a liquid channel, and the two sides are air channels; in normal operation, the hot end 13 is at a higher temperature than the cold end 14; when the unidirectional heat transfer heat pipe works, the liquid working medium at the hot end 13 is heated and changed into a gaseous working medium, and the gaseous working medium flows to the cold end 14 through air passages at two sides. Because the temperature of the cold end 14 is relatively low, the gaseous working medium is liquefied when meeting cold phase transition, and forms liquid state at the cold end 14; the liquid working medium in the liquid channel is caused to flow to the hot end 13 rapidly due to the unidirectional characteristic of the Y-shaped diversion tables 5 on the upper surface and the lower surface and the capillary force generated by the gap 6 between the Y-shaped diversion tables 5 on the upper surface and the lower surface, and then the working medium is heated again to be evaporated to be changed into a gaseous state to flow to the cold end 14, so that the liquid working medium is circulated and reciprocated to transfer the heat energy of the hot end 13 to the cold end 14, thereby having the heat transfer effect.

Reverse heat resistance: when the temperature of the heat radiating element contacted with the cold end 14 is higher than the temperature of the heating element contacted with the hot end 13, the liquid working medium in the cold end 14 is heated and changed into a gaseous state and flows to the hot end 13, and the gaseous working medium is liquefied when meeting cold because the temperature of the hot end 13 is relatively low, so that the liquid state is formed at the hot end 13; because of the unidirectional characteristic of the Y-shaped flow guiding table 5 structure, the liquid working medium cannot flow from the hot end 13 to the cold end 14, so that the liquid working medium is gathered at the hot end 13, and the cold end 14 is burnt out due to no working medium input, so that the heat transfer device is invalid; the heat transfer device can not transfer heat reversely, and can protect electronic products.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims

1. The unidirectional heat transfer heat pipe with the liquid suction core of the Y-shaped flow guide table is characterized by comprising a first heat transfer component and a second heat transfer component, wherein the first heat transfer component and/or the second heat transfer component are/is provided with flow guide grooves, one sides of the first heat transfer component and the second heat transfer component, which are provided with the flow guide grooves, are mutually connected to form a sealed flow guide cavity, the bottom surface and the top surface of the flow guide cavity are respectively and uniformly provided with Y-shaped flow guide tables with consistent directions, and the flow guide cavity is filled with working media;

the Y-shaped diversion tables are uniformly arranged along the length direction and staggered along the width direction, the bifurcation parts of the Y-shaped diversion tables at the non-edge positions are positioned between the straight line parts of two adjacent Y-shaped diversion tables, a gap is reserved between the Y-shaped diversion tables on the bottom surface and the top surface of the diversion cavity, the Y-shaped diversion tables have hydrophilicity, and when working media flow to the tail ends of the straight line parts, the working media are sucked to the bifurcation parts of the Y-shaped diversion tables at two adjacent sides.

2. The unidirectional heat transfer heat pipe with the Y-shaped flow guide table liquid suction cores according to claim 1, wherein a plurality of Y-shaped flow guide tables are distributed in the middle of the flow guide cavity along the width direction to form a liquid channel, and gas channels are arranged on two sides of the flow guide cavity along the width direction.

3. The unidirectional heat transfer tube of a Y-shaped diversion bench wick according to claim 2, wherein the side wall of the diversion cavity is provided with a liquid injection hole.

4. A unidirectional heat transfer tube with a Y-shaped diversion bench wick according to claim 3, wherein a protruding part is arranged outside the first heat transfer assembly, the liquid filling hole penetrates through the protruding part, a mounting hole is coaxially arranged on the protruding part and is coaxial with the liquid filling hole, and a liquid filling tube is inserted into the mounting hole.

5. The unidirectional heat transfer heat pipe with a Y-shaped diversion bench wick according to claim 1, wherein the diversion cavity is in a negative pressure or vacuum state.

6. The Y-shaped baffle plate wick unidirectional heat transfer heat pipe of claim 1, wherein the first heat transfer component is a heat transfer box and the second heat transfer component is a heat transfer cover, and the Y-shaped baffle plate is located on the bottom of the inner wall of the heat transfer box and the bottom wall of the heat transfer cover, respectively.

7. The Y-shaped baffle wick unidirectional heat transfer heat pipe of claim 6, wherein the heat transfer cover is made of a transparent material.

8. A method of manufacturing a unidirectional heat transfer heat pipe with a Y-shaped baffle plate wick according to claim 4, comprising the steps of:

s3, performing hydrophilic treatment on the Y-shaped diversion table;